# C1589 — Separate the Flood plateau from the Creation difference

## Question

Does910 translate the whole MT–LXX cumulative genealogy, or only a named part of it?

## Sources

```json
[
  "cumulative_source_nodes_inherited.json",
  "prefix_source_rows_inherited.json",
  "File18 §6"
]
```

## Opened utc

2026-09-29T14:53:34.809560+00:00

## Results

```json
{
  "Flood_Shem_Noah": {
    "F": {
      "LXX_minus_MT": 910,
      "SP_minus_MT": -120
    },
    "S": {
      "LXX_minus_MT": 910,
      "SP_minus_MT": -120
    },
    "N": {
      "LXX_minus_MT": 910,
      "SP_minus_MT": -120
    }
  },
  "LXX_Lamech_difference": -20,
  "LXX_creation_difference": 890,
  "source_Creation_decomposition": [
    460,
    430
  ],
  "source_Flood_decomposition": [
    460,
    450
  ]
}
```

## Finding

Equal600-year Shem and950-year Noah lives preserve910 through those boundaries. LXX Lamech755 versus MT775 then reduces it to890=460+430 at Creation.

## Reassessment

The correct source explanation is local: now test which of these source differences survives the declared lower-leg reversal.

## Checks

```json
{}
```

## Closed utc

2026-09-29T14:53:34.810130+00:00

## Record provenance

Exact record hash: `b76cb285202fadb5cc8ad036d14ce2e007f68f8f627fb2b295f52514f4b141ab`

Source journal: `Research_Cycles/C1585_C1634/journal.json`